Correct me if I'm wrong, I believe the range of the Raketen is 50 whereas ZIS is 60, or I'm running off old stats.
No, that's true. Raketen's range is 50. The penetration values to determine whether they will damage a vehicle they hit however, are exactly the same, 180/190/200. So Raketen will have 180 penetration at range 50, 190 penetration at range 25 and 200 next to them, while ZiS-3 will have 180 at range 60, 183.33 at range 50, 190 at range 30, 191.66 at range 25, and 200 next to them.